• NASA is building a nuclear reactor for the Moon by 2030.
• The reactor is part of a new directive reviving space-nuclear ambitions.
• Nuclear propulsion could carry humans to Mars in the decade after.
• NASA and the U.S. Department of Energy have signed a memorandum of understanding.

This development may signal a significant shift in NASA's approach to deep space exploration, potentially enabling more sustainable and efficient missions to the Moon and beyond. The use of nuclear propulsion could indicate a major breakthrough in space travel, which suggests that human missions to Mars may become more feasible in the coming decades.